/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.extensions.sql.impl.rule;



import com.bff.gaia.unified.sdk.extensions.sql.impl.rel.UnifiedLogicalConvention;

import com.bff.gaia.unified.sdk.extensions.sql.impl.rel.UnifiedSortRel;

import org.apache.calcite.plan.Convention;

import org.apache.calcite.rel.RelNode;

import org.apache.calcite.rel.convert.ConverterRule;

import org.apache.calcite.rel.core.Sort;

import org.apache.calcite.rel.logical.LogicalSort;



/** {@code ConverterRule} to replace {@code Sort} with {@code UnifiedSortRel}. */

public class UnifiedSortRule extends ConverterRule {

  public static final UnifiedSortRule INSTANCE = new UnifiedSortRule();



  private UnifiedSortRule() {

    super(LogicalSort.class, Convention.NONE, UnifiedLogicalConvention.INSTANCE, "UnifiedSortRule");

  }



  @Override

  public RelNode convert(RelNode rel) {

    Sort sort = (Sort) rel;

    final RelNode input = sort.getInput();

    return new UnifiedSortRel(

        sort.getCluster(),

        sort.getTraitSet().replace(UnifiedLogicalConvention.INSTANCE),

        convert(input, input.getTraitSet().replace(UnifiedLogicalConvention.INSTANCE)),

        sort.getCollation(),

        sort.offset,

        sort.fetch);

  }

}